Kimye is set to tie the knot on Saturday in Florence, and Kim has turned to Kate Middleton’s dress designer Sarah Burton for help.

A source told RadarOnline.com, “She has called on Sarah Burton to design one of her options. Kim wants the low-cut V-neck look that Kate had, but much lower, and she wants her gown to be tight-fitting to show off her svelte figure.”

The insider continued, “Her gown is estimated to cost $2 million. And no one will see the gown until she walks down the aisle. There are three gowns that were made just for her and she hasn’t even decided yet between them.”

The entire affair is supposed to be off the hook.

Friends Jay Z and Beyoncé are slated to perform a short show, to the tune of a purported $2 million -- Radar said the couple is still working out a deal with E!